Thread-advancing reel



June 10, I952 c. A. CASTELLAN 2,599,692

THREAD-ADVANCING REEL Filed Sept. 26, 1947 I I5 Sheets-Sheet 1 .3 38 a I 4 F5 INVENTOR. ARL A. CAJTELLAN J1me 1952 c. A. CASTELLAN THREAD-ADVANCING REET Filed Sept. 26, 1947 5 Sheets-Sheet 3 INVENTOR. CARL A CASTELLAN Patented June 10, 1952 THREAD-ADVANCING REEL Carl A. Castellan, Media, Ra, assignor to American. Viscose Corporation, corporation of Delaware Wilmington, Del.,, a-

Applicationrseptember 26, 1949,. Serial No. 776,319

19 Claims.

This invention relates to thread-advancing reels and is primarily concerned with a. novel formof reel embodying a new. principle of. con

struction and operation.

It. is an object of the present invention to provide a thread-advancing reelwhich does not require the provision of eccentric or askew axes for. mounting certain of-thethread-carrying bars thereof. Another object of the invention is to provide aform of reel utilizing barsior carrying thethreadwhich are expansible and contractible in agenerally radial direction relative to the reel. Other objects. and advantages of the in.- vention willbe apparent from the. drawing. and the description thereofhereinafter...

In the drawing, which isillustrative of preferred embodiments of the invention:

Figure 1 is an axial crosssection throughone embodiment,

Figure 2v is r a cross-section taken. on line IL-II of Figure 1,

Figure 3- is; an axial cross-section through a modification,

Figured is an end viewwiththe topmost and lowermost bars shown in section taken on lines live-IV of FigureB,

Figure-5 .is asdeveloped view of the cam grooves of the reel in Figure *3,

Figure-6 is a longitudinal. cross-section through a modified, form. of' expansible bar; which i can be substituted for that shown-in Figures3, and- Figl re 7 is an end view; of anupper portion of areel embodyingbars of the'type shown. in Figure 6-.

The thread-advancing action of reels'.-constructed' in 1 accordance with the present invention involves the lifting of the thread from one s.et-.. of; bars. by; the radial. expansion oianother set of, bars so thattheouter surface of the second setf, project beyond 1 the periphery, defined by the bars of F the first set. After the-expanded bars lift. the; thread: from the. other bars, such expanded) bars are moved. axially to advance the; thread and after; such-movement, they are contracted radially so thattheir; outersurfaces are retreated to positions, Within the periphery defined. by; the other; set,; at which time they can. be moved back; in preparation 1 for the. sub- SBquentexpansion and;threadadvancingstroke.

One-or both sets. of bars may be radiallyexpansible inthisimall er, it bein only necessary when both sets areexpansibler h tlea h expanded at.;a;part of? the. cycle of." operations during; which 2. the other set is.:- in. a}. contracted condition.

Accordingly, the reel of the present invention comprises a plurality of bars, certain of which are. radially expanded relative to. certain other bars alternating. therewith at one part of the cycle ofjrotation and radially contracted relative to, the other set of bars at a succeeding part: of the. cycle, of rotation andeither or both sets may be moved while. carrying the thread to advance the, thread toward. one end of the reel;

Figures 1 and 2 illustrate one form of the invention. comprising. a plurality of radially ex:- pansible and contractible bars 31 and these. bars interdigitate with bars 4' which may also be radially expansible and contractible, but as shown, the bars 4" are of rigid construction, being formed. atthe outer periphery of a generally cylindrical. member 5 having al hub. G by grooving such. periphery in a generally axial direction. 'Ilie bottom of. the grooves are. indicated at 7. The rotatable member 5 issecured toa driving shafttllv for rotation therewith such as by means of akey 9, a nut Ill and washer In; The.shaft.8 projects through a frame member. Hand through asleeve 12" which is secured to theframemember II. by means of cap screws 13 extending through the flange [4 and has a projecting cylindrical bearing surface l5. Between the end of the sleeve I 2 andfthe hub 6. there. is: provided a bearing. Washer I 6 and. a bushing l1 may be provided between the shaft and. thesleeve. Adjacenttheshoulder I 8 there may. be'provided. on the sleeve H a camhaving an annular.camsurfacev I 9; The expansible' and contractible bars 3aresecured" by screws 20' to shoes .21 axially slidable onv the surface I 51 As shown; clearly iniFigure. 2, they base portion of the shoes may beef. wedgeshape toprovideqlateral. bearing. planes 2] between adjacent shoes. springs 221 andv 23 surroundlthe. axially projecting portions of these shoes and press them against the. surface l5. These shoeshave axially projectingrods-iM-i extending intobores 25 within the rotatable member 5-and springs 26 bearing against thepins 24: urge the shoes against the cam surface l.9. at all times" The stationary sleeve I2 is provided with a bore-21 terminatingin an arcuate port 28"extending, circumferentiallyabout the sleeve andlcommunicatinggwith the bore 29. extending through theshoeandithe bar to an inflatable element .30 atwthe outer peripheryof. the bar. Element 30w may hehmade ofvrubber; substitute or synthetierrubber and'normally takes the flattened or deflected condition shown at the bottom of Figures 1 and-2: unlessinflated. The-passage pass over the port 3 29 is provided with a widened port 3| to assure intercommunication between port 28 and bore 29 regardless of the axial portion of the shoe which depends upon the position thereof relative to the cam.

An axially extending bore 532 communicates with a port 38 extending circumferentially about the sleeve 52 and approximately in the same axial plane as that of port 28. A conduit 34 serves as the inlet to passage 27 and is connected to any suitable source of fluid, either liquid or gaseous. Compressed air is of advantage for reasons of economy though water supplied under pressure may be used. The passage 32 is connected to a conduit 35 which may simply be open to the atmosphere. Optionally, a passage 35 may communicate with port 33 either exclusively or along with passage 32 and this passage as terminates in a port 3'! opening to the interior of the reel. It may co-operate with the sleeve-like sealing boot 33 to prevent entrance of corrosive liquids into the bearing system by creatinga pressure above atmospheric within the boot. The sleeve sealing boot 38 may be secured at one end by a ring 39 and the other end may simply have a sliding fit around the shoulder 58 on the sleeve l2. The sleeve sealing membrane 38 is provided with openings at 32 in the plane of which the juncture 43 between the shoe and the bar is made 7 so that the edge of the membrane surrounding the opening is clamped between the shoe and the bar in tight sealing engagement.

The inflatable element 38 extends longitudinally and forms the outer periphery of the bar.

It may simply consist normally takes a deflated form as shown at the bottom of Figures 1 and 2. The lower surface of the tube is secured to the longitudinally extend ing rigid supporting structure or bar-like element 44, such as by cement, an adhesive, or by vulcanization. This securement may be provided over the entire width of the tube or it may be only along a central strip thereof extending the entire length of the bar and, of course, surrounding the opening 45 by which the fluid is introduced into the tube.

In operation, the shaft 3 is driven which rotates the member 5 and the bars As the shoes 2!. pass over the port 23, fluid is forced into the tubes which then lift the yarn or thread off the bars l. After this lifting, the cam surface I?! 3 to advance the thread, preferably toward the free' end of the reel (that is, to the left of Figure l) Thereafter, the shoes reach a dwell portion of the cam surface [9 and then 33 so that the fluid in tubes 30 is discharged. When this discharge occurs, the thread is transferred to the bars 4 and the shoes of .the bars .3 then proceed over a portion of cam surface 19 which allows them to be returned under the action of springs 26 in preparation for subsequent inflation and thread-advancing motion. The discharge of the fluid, especially if it is air or other non-corrosive material, such as oil, through passage 36 into the region surrounding the working parts within the flexible sealing membrane 38 prevents any corrosive liquids or gases from entering such region through the sliding juncture between the seal 38 and shoulder [8.

Figures 3 to 5 illustrate a modification comprising a drive shaft 46 extending through the frame member 51 to which is secured a member 48 having a sleeve projection 49 and a hood or shroud 59. 'A bushing 5! may be provided between the shaft 46 and the sleeve 49 and on the slides the bars of a long rubber tube which outside of the sleeve another bushing 52 is provided between it and a supportingmember 53. The supporting member 53 is provided with axially spaced disc-shaped members 54 and 55, each having bushed openings 54' and 55 respectively disposed in circular rows. A plurality of sleeves 56 are axially slidable within the hushed openings 55' within the member E i-and rods 51 disposed concentrically within the sleeve 56 are axially slidable within the hushed openings 55' of the member 55.

The sleeves 56 are provided with cam follower rolls 58 which ride in a cam groove 59 in a cam 66. Rods 5'! are provided with collars Bi and springs 62 bearing against the collars press the ends of the rods 51 against a cam 63.

At its outer end, the shaft carries a generally cylindrical member 64 having a plurality of peripheral grooves 65 extending parallel to the axis, which grooves leave a plurality of thread-carrying lands or bars 66 therebetween. A nut 61 and washer 58 serve to hold the assembly upon the shaft 56 and a key 69 assures rotation of member 04 with the shaft.

Within the peripheral grooves 65 of the member 64 a plurality of expansible bars H! are provided. Such bars comprise the centrally disposed rod 51, an external elastic sleeve H (such as of rubber, or synthetic or substitute rubbers) a pair of long shoes or plates 12 extending parallel to each other and disposed so that one is radially outwardly spaced from the other and serves to support the elastic sleeve or tube II and any thread convolutions surrounding the reel periphery and is in contact with the elastic tubes. Each of the tubes H is secured at one end to the inside periphery of a sleeve 56 and to a plate or disc 13 fixed within the sleeve 56. The securement may be effected by any suitable cement or adhesive, or by direct vulcanization thereto. A collar 14 secured to the plate 13 carries ears or lugs 15 to which are pivotally secured links 16 which constitute the end links of a lazy-tong lever system comprising a plurality of intermediate links l1 which are pivotally connected together where they cross one another and have their ends pivotally joined to shoes 13 which slidably engage within a groove 19 within the plate 12. The rod 51 is slotted from point a to point 12 (Figure 3) to accommodate the crossed links 71 slidably be-- tween the lateral sections of the rod 57. End links 16' are secured to ears 15 on a collar 14 fixed to rod 51. Advantageously, the end shoes 18 adjacent collar 14 may be secured rigidly to the plates 12 whereas the remainder of such shoes lag are adapted to slide in the grooves 19 on plate An end plate may be secured to the outer end of the reel member 64, such as by means of a spring metal disc 'Bl secured thereto having the spring prongs 82 adapted to resiliently grip an annular recess or groove 83 provided within the member 54. The plate 80 is provided with a plurality of bores 84 through which rods 51 are adapted to reciprocate.

The member 64 and expansible bars 10 are rotated by the shaft 46 relative to cams 60 and 83 which may be prevented from rotation by means of one or more pins 85 and a key '86 respectively. The pin 85 projects into a bore 8'! within the sleeve 49 and the key 86 secures cam 63 to the sleeve 49 to prevent its rotation.

The space occupied by the bearings may be protected from the action of any liquids showered upon threads carried on the reels by providing a labyrinthine seal comprising one or more in we dlyprcjecting-rings 88 withinthe inner peripnery of the hood 50 adjacent the outer ends of sleeves 56 and another flexible ring 89. Thering s s riiay' besecured-to the member by means of a ring 9 and may be provided with openings adapted to surround: the expansible bars 1 l and to bese'cu-redtd-the outer endsof the sleeves 56 from which the expansible bars project. The cease re providedwith accordion-like an n r pleats between-its positions of securement to -the 'emhe r" Mend-the sleevesifi toallow roleativ'e axial motion therehctwee'n, Advantageous- 1y, tfifi'exible n'iaterial such as leather, rubber, synthtic or" substitute rubbers.

Figure shows the developed cam groove of cam 60 and the path'of camga fter. projected upon a common cylindrical plane 63 and the legends adjacent the cam tracks indicate theeifect of the cams-i upon the operation of the reel. The arrow ndica'te's the direction of travel: of the ronowersana it will be noted that the portions 'I -and-Taof'the cam tracks atithe top of Figure 5 are parallel and the bars 19 are in radially expanded condition so that they carry the thread convolutions thereon. Theparallel portions of the' cam tracks cause bothzthe rod- 51 and the sleeve .56 (carrying the bar- 102 assoc-iat'edtherewith) to move to the left as viewed" in Figure 8; theretiy advancing the; thread toward the free end ofthereel: At the endofthis. pa'rallelportion of the camtracks, cam 60 turns back, so that the center-lineaof the followerifl follows a, circular arc- 0 a plane at right angles to the axis of the reel, whereas the track Ca of cam 63 is inclined' at -a-mu'chisharper angle tosuch a plane than its'lpreviousportion Ta.- Thiscauses the rod Smto movefurther tothe-left, thereby moving the coll'ar 'l d with itfland expanding the lazytong lever system lengthwise. In so expanding thelazy-tongleversystem, the radial dimension thereor is contracted' as viewed at the bottom of Figures 3 and 4. When this contraction occurs, the" thread convolutions are returned to the bars '66 'of-th'e reel member Stand itlwill be noted that-thenex-t portions. R and Ra of the, cam traces return the rod 5l with thesleeve 56 (and the bar carr'iedthereby) as a unit while maine taining thebarin the contracted condition. Thisis accoinplished by making cam track, portions R and/Ra parallel. When the expansible bar has thusbeen returned, cam 6 veers back into an arc E in aiplane which is atright angles to the axis of the reel and cam 63 changes along Ea-to adirectioninclined more steeply relative to sucha plane so that-rod 57 is moved axially toward thezriglitas viewed in Figure 3 which causes shorteninglofthe lever tong system, and radial expension of the bar- 10. This causes bars I0 to protrude from, and lift the thread from, the periphery-of bars 66 in preparation ,for another thread-,ad-vancing cycle.

As inthe embodimentofFigures 1 and 2, that ot Figures 3 tou5- also, utilizes plurality of pansibleand contractiblebars which are mounted concentrically with respect tothe axis of rotation of the reel and, when the, otherset of bars are of rigidconstruction as shown, the reel maybe considred to be constituted of two sets of bars rotatedabout the same axis. Each set is concentrically relatedto that of the other.

' Figures fi ,and 7-;i1lustrate a modification of an ex ansi bie and contractible bar adapted to be substituted for that-shown in Figures 3 to 5. It

s1 88 and 89-m'ay be: formed of any,

consists of. a rod T 51w sl-i'dable in the ibushedaopene ring: 5 5.1 or-the disc 55 .and haymg a: collar? 611i and such sleeve having a follower: 518. coeoperatina.

with the groove 56 of acaml 610-; asinFieureS 3=to 5. The rodBJamay be.:ofrcylindricallohany other cross-section and is, provided; toward its outer end with an enlargedri'ngor flange 92 from which ithas a continuation, or extension-p? je'cting through a, bore; 84;: within the, plate 811% as in.Figure's13- to 5'. A; rubbentubefl; surrounds the rod 5:'la.and is secured tmthe. sleeve M3. plate 13a, and :sleeve. '56 attone Elfldifillld to the, ringsor flange 92 at the otl1e1i end-.-. Thevroderlmrissnq secured to the inside wall ofthe, tube.- 931 except adjacent the enlarged ring; or flange; 92-, The tube 93: istforrned of an; elastic material; which normally tends to contractlengthwise;and: has peripheral wall ofrsuch a; thickness that in changing from, contracted to tully expander! condition longitudinally (which change is efiect edby forcing theshoulderwflifurther awayrom the sleeve .92! in response toxthemovement of cam 58), the efiective; diameter, ofjthe' bar is: reduced so as to recede. ventirelyginto the, groove-65 101i; the

reel member 64,- whereas in being; shorten dthe movement of :flangeSZ; inathe-opposite direction, the peripheraltwall thichnessgofr tube 53 m.- creases .to such an extentias to projectrout beyond the periphery defined, by. bars; 66;. and: lift, the thread convolutions therefrom. RUbbBiiSy-fir-fiflfld example ofsuch. a material and synthetic and substituteirubbershaving rubbery elasticity may also serve this purpose. The.cross-section of the sleeve 93'may" he circular oryovalasgshowmin Figure '7, but when oval, the lone-transversedim'ension or axis is preferahl-ydisposed, radiall-ynof the reel.

The track of cams 601 and; of this embodb ment may correspond in every way to thoseyshown in Figure 5. Regardless ot whichv form Ofllr pansible, and contractible bar; is employed; how:- ever, the cam tracksishown imFigureowmaybe varied widely; For example. instead :of; effecting thread advance during approximatelyv rota? tion, as shown in Figure 5, the;threa1d advance may be effected in amuch shorterqarcyorpiti-may occupy amuch longer arc. Similarly, the-radial contractionof the bar. may. be efiectedtmoz-e or: less quickly than'shown and this is truexalsoof theretur n stroke andiradial expansion of the-bar.

It is to be-understoodthat changes and variations may be made without departing rromnthe spirit and scope of the invention asidefined' in the appended claims.

I claim:

1; A- thread-advancing reel comprising a plu rality of generally parallelbars, alternate ones of the bar being reciprocable longitudinally and being ex'pansible andcontractible in a transverse direction extending generally radially of the reel, said alternate bars having, at least when in contracted condition, their centers disposed concentrically about a commonaxis (if-rotation. the other bars being rigidand'having their-cem ters disposed concentrically about said common axis of rotation generally'parallel togtheirlength, mean for rotating the reel about its axis, means for selectively contracting andexpandingsaid alternate barsin succession'during rotation of the reel-to protrude and-retract respectively at predetermined times their outer surfaces relative to the outer surfaces of the intervening bars, and means for moving said bars toward one end of the reel when they protrude relative to the other bars and toward the other end of the reel when they are retracted relative to the other bars.

2. A thread-advancing reel comprising a rotatable member having a plurality of axially extending lands alternating with grooves at the outer periphery of the memben'a plurality of expansible and contractible longitudinally reciprocable bars disposed longitudinally in the grooves and mounted for rotation about the axis of rotation of the rotatable member, the expansible and contractible bars being mounted with their centers disposed concentrically about the axis of the reel and the surfaces of the lands being concentric with respect to said axis, means for selectively contracting and expanding said bars in succession during rotation of the reel to project and retract respectively at predetermined times their outer surfaces relative to the outer surfaces of the intervening lands, and means for sliding the bars toward one end of the reel when they project and toward the other end of the reel when they are retracted relative to the lands.

3. A thread-advancing reel in accordance with claim 2 in which the expanding and contracting means comprises a stationary cam and the sliding means comprises a stationary cam.

4. A thread-advancing reel comprising a plurality of longitudinally extending bars laterally spaced apart from each other, alternate ones of the bars being longitudinally reciprocable and belng'expansible and contractible in a transverse direction extending generally radially of the reel, said alternate bars having, at least when in contracted condition, their centers disposed concentrically about a common axis of rotation, the other bars being rigid and having their centers disposed concentrically about said common axis of rotation and providing in conjunction with the aforesaid alternate bars a reel circumference adapted to carry convolutions of thread, said expansible and contractible bars each comprising an inflatable member, means for rotating the reel about its axis, means for selectively inflating and-deflating the inflatable member to cause said alternate bars in succession during rotation of the reel to protrude and retract respectively at predetermined times their outer surfaces relative to the outer surfaces of the intervening bars, and means for moving said reciprocable bars toward one end of the reel when they protrude relative to the other bars and toward the other end of the reel when they are retracted relative to the other bars. I

' 5. Areel in accordance with claim 4 in which each inflatable member is disposed at the outer periphery of its respective bar and the outer surface of the inflatable member serves to carry the thread when expanded.

6. A thread-advancing reel comprising a rotatable member having a plurality of axially extending thread-supporting lands alternating with grooves at the outer periphery of the member, a stationary sleeve, an inlet port and a discharge port in such stationary sleeve, axially reciprocable shoes having ports, a bar on each of said shoes extending longitudinally in each of the grooves, an inflatable element on the surface of each of said bars, the ports in said shoes being arranged to communicate with the inflatable elements on said bars, and means for axially reciprocating the shoes and for rotating said shoes 7 about the stationary sleeve to selectively connect the port in each shoe in succession with the inlet port and then in succession with the discharge port.

7. A thread-advancing reel comprising a rotatable drive shaft, a member having a plurality of axially extending lands alternating with grooves at the outer periphery of the member, said member being mounted on the shaft to be driven thereby, a rotatable supporting element, a plurality of bearings in the element having their centers disposed in a circle concentric with the axis of the element, a plurality of sleeves slidably mounted in the bearings, expansible bars carried by the sleeves and projecting into the grooves of the rotatable membena camfor reciprocating the sleeves in the bearings, and cam means for expanding the bars.

8. A thread-advancing reel in accordance with claim '7 in which the bars comprise an elastic sleeve about a central rod, the elastic sleeve is secured at one end within the first-mentioned sleeve, and the rod carries a cam follower for cooperating with the cam means for expanding the bars.

9. A thread-advancing reel in accordance with claim 8 in which the rod is secured to the elastic sleeve adjacent one end thereof and projects through the other end of the elastic sleeve to the cam follower.

10. A thread-advancing reel in accordance with claim 8 in which a lazy-tong lever system is connected to the rod within the elastic sleeve adjacent its free end and rigid bearing plates are carried by the lever system within the elastic sleeve.

11. A thread-advancing reel comprising a rotatable drive shaft, a member having a plurality of axially extending lands alternating with grooves at the outer periphery of the member, said member being mounted on the shaft to be driven thereby, a rotatable supporting element, a plurality of bearings in the element having their centers disposed in a circle concentric with the axis of the element, a plurality of sleeves slidably mounted in the bearings, expansible bars carried by the sleeves and projecting into the grooves of the rotatable member, a stationary cam for reciprocating the sleeves in the bearings, and stationary cam means for expanding the bars.

12. A thread-advancing reel in accordance with claim 11 comprising a shroud about the driving elements at one end thereof and an annular labyrinthine seal between the shroud and the rotatable member.

13. A thread-advancing reel comprising a plurality of generally parallel bars, alternate ones of the bars being longitudinally rec'iprocable' and being expansible and contractible in a transverse direction extending generally radially of the reel, said alternate bars having, at least when in contracted condition, their centers disposed concentrically about a common axis of rotation, the

- other bars being rigid and having their centers disposed concentrically about said common axis of rotation, said axis of rotation being generally parallel to the bars, means for rotating the reel about its axis, cam means for alternately contracting and expanding said alternate bars during rotation of the reel to alternately protrude and retract their outer surfaces relative to the outer surfaces of the intervening bars, and cam means for moving said bars toward one end of the reel when they project relative to the other bars and toward the other end of the reel when they are retracted relative to the other bars.

14. A thread-advancing reel in accordance with claim 13 in which the bars comprise an elastic sleeve about a central rod, the elastic sleeve is secured at one end to the cam means for moving the bars, and the rod is reciprocated by the cam means for expanding the bars.

15. A thread-advancing reel in accordance with claim 13 in which the bars comprise an elastic sleeve about a central rod, the elastic sleeve is secured at one end to the cam means for moving the bars, and the rod is secured to the elastic sleeve adjacent one end thereof and projects through the other end of the elastic sleeve into engagement with the cam means for contracting and expanding the bars.

16. A thread-advancing reel in accordance with claim 13 in which the bars comprise an elastic sleeve about a central rod, 2. lazy-tong lever system is connected to the rod within the elastic sleeve adjacent its free end, and rigid bearing plates are carried by the lever system within the elastic sleeve.

1'7. A thread-advancing reel comprising a plurality of longitudinally extending bars laterally spaced apart from each other about a common axis of rotation and providing a reel circumference, alternate ones of the bars being longitudinally reciprocable and comprising an inflatable member which upon inflation and deflation is expansible and contractible in a transverse direction extending generally radially of the reel, means for rotating the reel about its axis, means for selectively inflating and deflating the inflatable members of said alternate bars in succession during rotation of the reel to protrude and retract respectively at predetermined times their outer surfaces relative to the outer surfaces of the intervening bars, means for moving said bars toward one end of the reel when they protrude relative to the other bars and toward the other end Of the reel when they are retracted relative to the other bars, a sealing element for enclosing the moving means, and means for creating a fluid pressure above atmospheric within the element.

1B. A thread-advancing reel comprising a plurality of longitudinally extending bars laterally spaced apart from each other about a common axis of rotation and providing a reel circumference, alternate ones of the bars being longitudinally reciprocable and being expansible and contractible in a transverse direction extending generally radially of the reel, means for rotating the reel about its axis, means for selectively contracting and expanding said alternate bars in succession during rotation of the reel to protrude and retract respectively at predetermined times their outer surfaces relative to the outer surfaces of the intervening bars, means for moving said bars toward one end of the reel when they protrude relative to the other bars and toward the other end of the reel when they are retracted relative to the other bars, a sealing element for enclosing the moving means, and means for creating a fluid pressure above atmospheric within the element.

19. A thread-advancing reel in accordance with claim 18 in which the bars comprise an elastic sleeve about a central rod, the elastic sleeve is secured at one end to said bar-moving means, and the rod is connected for reciprocation by said contacting and expanding means.

CARL A. CASTELLAN.

REFERENQE S CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,052,125 Boos Feb. 4, 1913 2,378,211 Furness June 12, 1945 2,428,703 Ewing Oct. 7, 1947 2,428,704 Ewing Oct. 7, 1947 2,429,534 Stone Oct. 21, 1947 2,441,583 McDermott May 18, 1948 FOREIGN PATENTS Number Country Date 869,390 France Nov. 7, 1941 

